dnssector 0.2.14

A very fast library to parse, validate, create and mangle DNS packets
Documentation 
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use dnssector::*;
#[cfg(feature = "hooks")]
use libc::c_int;
#[cfg(feature = "hooks")]
use libloading::{Library, Symbol};

#[cfg(feature = "hooks")]
use crate::c_abi::{self, FnTable};

pub fn main() {
    let packet: Vec<u8> = vec![
        0x4d, 0x32, 0x85, 0x00, 0x00, 0x01, 0x00, 0x05, 0x00, 0x05, 0x00, 0x01, 0x01, 0x61, 0x05,
        0x61, 0x6c, 0x69, 0x61, 0x73, 0x04, 0x73, 0x74, 0x64, 0x63, 0x03, 0x6f, 0x72, 0x67, 0x00,
        0x00, 0x01, 0x00, 0x01, 0xc0, 0x0e, 0x00, 0x27, 0x00, 0x01, 0x00, 0x00, 0x0e, 0x10, 0x00,
        0x0e, 0x08, 0x70, 0x75, 0x72, 0x65, 0x66, 0x74, 0x70, 0x64, 0x03, 0x6f, 0x72, 0x67, 0x00,
        0xc0, 0x0e, 0x00, 0x2e, 0x00, 0x01, 0x00, 0x00, 0x0e, 0x10, 0x00, 0x5c, 0x00, 0x27, 0x0d,
        0x03, 0x00, 0x00, 0x0e, 0x10, 0x59, 0x53, 0xb6, 0xf8, 0x59, 0x2c, 0x29, 0xf8, 0x2a, 0xff,
        0x04, 0x73, 0x74, 0x64, 0x63, 0x03, 0x6f, 0x72, 0x67, 0x00, 0x0c, 0xb4, 0xe8, 0xb4, 0xa2,
        0x1c, 0xff, 0xd5, 0xfe, 0x94, 0x26, 0xf7, 0xc8, 0x80, 0x43, 0x33, 0xce, 0xaf, 0x50, 0x57,
        0xf3, 0xa0, 0x52, 0xb7, 0xf8, 0x70, 0xd1, 0xcf, 0x21, 0xe2, 0x92, 0x04, 0xcf, 0x10, 0x6d,
        0xc1, 0xcb, 0xfa, 0x13, 0xdb, 0x9e, 0x9c, 0xa5, 0xc2, 0xcd, 0x9f, 0x05, 0xc4, 0xf0, 0x82,
        0xfb, 0x75, 0x30, 0xce, 0x6f, 0x06, 0x33, 0xfb, 0x34, 0x00, 0xc2, 0x7d, 0xf6, 0x48, 0xc0,
        0x0c, 0x00, 0x05, 0x00, 0x01, 0x00, 0x00, 0x0e, 0x10, 0x00, 0x0d, 0x01, 0x61, 0x08, 0x70,
        0x75, 0x72, 0x65, 0x66, 0x74, 0x70, 0x64, 0xc0, 0x19, 0xc0, 0xb0, 0x00, 0x01, 0x00, 0x01,
        0x00, 0x00, 0xa8, 0xc0, 0x00, 0x04, 0x4e, 0xc2, 0xdb, 0x01, 0xc0, 0xb0, 0x00, 0x2e, 0x00,
        0x01, 0x00, 0x00, 0xa8, 0xc0, 0x00, 0x60, 0x00, 0x01, 0x0d, 0x02, 0x00, 0x00, 0xa8, 0xc0,
        0x59, 0x53, 0xb6, 0xf2, 0x59, 0x2c, 0x29, 0xf2, 0x31, 0xf3, 0x08, 0x70, 0x75, 0x72, 0x65,
        0x66, 0x74, 0x70, 0x64, 0x03, 0x6f, 0x72, 0x67, 0x00, 0x42, 0x6e, 0xcd, 0xad, 0xea, 0xca,
        0xac, 0xdf, 0x7c, 0xd0, 0x81, 0xd7, 0x0a, 0x3e, 0xad, 0x83, 0xcf, 0xd6, 0x76, 0x05, 0x28,
        0xbf, 0x46, 0xe1, 0x24, 0xb7, 0x47, 0x54, 0x85, 0x48, 0xd1, 0x4e, 0x10, 0x63, 0xe3, 0x0c,
        0xb6, 0xa4, 0xb9, 0xb9, 0x81, 0x03, 0x84, 0xd1, 0x46, 0x38, 0xf7, 0xeb, 0x86, 0x5d, 0x9d,
        0x45, 0x2d, 0xda, 0x3a, 0xeb, 0xea, 0xf0, 0xf9, 0x28, 0xdf, 0x81, 0x6c, 0xf7, 0x20, 0x62,
        0x6c, 0x37, 0x71, 0x64, 0x66, 0x38, 0x6e, 0x31, 0x72, 0x69, 0x68, 0x73, 0x37, 0x65, 0x6c,
        0x35, 0x64, 0x35, 0x36, 0x63, 0x6b, 0x61, 0x76, 0x33, 0x72, 0x71, 0x68, 0x65, 0x63, 0x31,
        0x68, 0xc0, 0xb2, 0x00, 0x32, 0x00, 0x01, 0x00, 0x00, 0x0e, 0x10, 0x00, 0x23, 0x01, 0x00,
        0x00, 0x02, 0x01, 0x01, 0x14, 0x93, 0x19, 0xc4, 0xdd, 0xd4, 0x84, 0x6b, 0x44, 0x03, 0x82,
        0x82, 0x8b, 0xca, 0x77, 0xdf, 0x26, 0x93, 0xee, 0xe0, 0x20, 0x00, 0x06, 0x40, 0x00, 0x00,
        0x00, 0x00, 0x02, 0xc1, 0x39, 0x00, 0x2e, 0x00, 0x01, 0x00, 0x00, 0x0e, 0x10, 0x00, 0x60,
        0x00, 0x32, 0x0d, 0x03, 0x00, 0x00, 0x0e, 0x10, 0x59, 0x53, 0xb6, 0xf2, 0x59, 0x2c, 0x29,
        0xf2, 0x31, 0xf3, 0x08, 0x70, 0x75, 0x72, 0x65, 0x66, 0x74, 0x70, 0x64, 0x03, 0x6f, 0x72,
        0x67, 0x00, 0x22, 0x82, 0x60, 0xfb, 0x06, 0xea, 0xc4, 0xd0, 0xdd, 0x59, 0xd3, 0x9a, 0x9b,
        0x43, 0xd9, 0xc5, 0xb3, 0xab, 0x86, 0x1e, 0xaf, 0xc3, 0xb9, 0x90, 0x0f, 0xc1, 0xd5, 0x40,
        0x14, 0x1e, 0xb3, 0x12, 0x4d, 0xdf, 0x73, 0x1a, 0x5f, 0xbe, 0x99, 0x4d, 0x6f, 0xd7, 0xf5,
        0xbf, 0x9b, 0xed, 0x63, 0x7e, 0x6c, 0xe9, 0x2a, 0x74, 0xc3, 0xd4, 0x8d, 0x5e, 0x98, 0x72,
        0xfc, 0xc1, 0x30, 0xdf, 0x68, 0x35, 0xc0, 0xb2, 0x00, 0x02, 0x00, 0x01, 0x00, 0x01, 0x5b,
        0xd2, 0x00, 0x0e, 0x04, 0x66, 0x72, 0x65, 0x65, 0x02, 0x6e, 0x73, 0x03, 0x63, 0x39, 0x78,
        0xc0, 0x19, 0xc0, 0xb2, 0x00, 0x02, 0x00, 0x01, 0x00, 0x01, 0x5b, 0xd2, 0x00, 0x0a, 0x07,
        0x72, 0x65, 0x63, 0x69, 0x74, 0x61, 0x6c, 0xc2, 0x06, 0xc0, 0xb2, 0x00, 0x2e, 0x00, 0x01,
        0x00, 0x01, 0x5b, 0xd2, 0x00, 0x60, 0x00, 0x02, 0x0d, 0x02, 0x00, 0x01, 0x5b, 0xd2, 0x59,
        0x53, 0xb6, 0xf2, 0x59, 0x2c, 0x29, 0xf2, 0x31, 0xf3, 0x08, 0x70, 0x75, 0x72, 0x65, 0x66,
        0x74, 0x70, 0x64, 0x03, 0x6f, 0x72, 0x67, 0x00, 0x9e, 0xa8, 0x72, 0xd1, 0xc4, 0x14, 0x8b,
        0x1e, 0x5d, 0x85, 0xce, 0x84, 0x51, 0x2c, 0xad, 0x8a, 0xd5, 0x88, 0x86, 0x6d, 0x10, 0xa5,
        0x1c, 0x4c, 0x1b, 0x20, 0xd4, 0x13, 0xc2, 0xfd, 0xe5, 0x77, 0xca, 0xd5, 0x5d, 0x61, 0xb6,
        0x23, 0xab, 0xbb, 0xa1, 0xd7, 0x90, 0xd4, 0x4f, 0x44, 0x11, 0xfa, 0xee, 0xe2, 0x0c, 0x26,
        0xf5, 0x7f, 0x79, 0xf3, 0x3f, 0xe7, 0x0f, 0x4e, 0xe6, 0xaf, 0x11, 0x08, 0x00, 0x00, 0x29,
        0x10, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00,
    ];

    let ds = DNSSector::new(packet).expect("cannot parse packet");
    let mut parsed_packet = ds.parse().expect("cannot run parser");

    #[cfg(feature = "hooks")]
    {
        let dlh = unsafe { Library::new("src/bin/c_hook/c_hook.dylib") }
            .expect("Cannot load the sample C library");

        let hook_deliver: Symbol<
            '_,
            unsafe extern "C" fn(*const FnTable, *mut ParsedPacket) -> c_int,
        > = unsafe { dlh.get(b"hook_deliver").unwrap() };

        let fn_table = c_abi::fn_table();
        let _ = unsafe { hook_deliver(&fn_table, &mut parsed_packet) };
        println!("flags after the C hook:      {:x}", parsed_packet.flags());
    }

    #[cfg(not(feature = "hooks"))]
    {
        parsed_packet.set_rcode(0);
    }
}